Trade Accounts and Bills Receivable, Net (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Trade Accounts and Bills Receivable, net [Abstract]
Trade accounts receivable	$ 15,893,702	$ 12,517,626
Less: Allowance for doubtful accounts	(5,237,564)	(4,650,686)
Trade accounts receivable, net	10,656,138	7,866,940
Bills receivable	83,187	85,480
Trade accounts and bills receivable, net	$ 10,739,325	$ 7,952,420